Looking for a steel building in Walnut, CA? Describe your project once and up to three steel building suppliers and erectors who work in Walnut and Los Angeles County get back to you with a quote. It's free and there is no obligation.
Walnut is home to about 27,250 people (2024 Census Bureau estimate), a shrinking community (−4.2% since 2020). With 3,031 people per sq mi, it is a suburban area. Shops, farm buildings and light industrial projects here often use pre-engineered steel.
Walnut at a glance
- Population (Census Bureau estimate, 2024)
- 27,250 (−4.2% since 2020)
- Rank in California
- 255th of 482 cities and towns
- Land area
- 9.0 sq mi
- Population density
- 3,031 people per sq mi (suburban)
- Type
- City (Walnut city)
- Main county
- Los Angeles County
What to check before hiring in Walnut
- Loads: in California, the building must be designed for local wind and snow loads.
- Permit: expect sealed drawings and a foundation design.
- Scope: compare kits, erection and turnkey on the same basis.
- Price drivers: size, height, doors, insulation and steel prices.
Useful official resources
-
Metal Building Manufacturers Association
Official information and guidance.
-
ICC: International Code Council
Official information and guidance.
Services available in Walnut
-
Steel building kit
Engineered pre-engineered metal building kit with sealed drawings for the permit.
-
Steel building erection and turnkey
Foundation, erection and finishing of a steel building.
Frequently asked questions in Walnut
How much does a steel building cost in Walnut, CA?
It depends on size, loads, doors, insulation and erection. Describe your building: pros who serve Walnut reply with a quote.
How long does it take?
Kits often ship in weeks; erection takes days to weeks.
Can I erect it myself?
Small kits can be; larger ones need experienced crews and equipment.
Which steel building suppliers and erectors will contact me?
Up to three independent steel building suppliers and erectors who serve Walnut and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.